javadoc fixes part 11 (ticket #1894)

apps/routerconsole/java/src/net/i2p/router/web/HelperBase.java

@@ -68,7 +68,7 @@ public abstract class HelperBase {
      *
      *  @param s string to be translated containing {0}
      *    The {0} will be replaced by the parameter.
-     *    Single quotes must be doubled, i.e. ' -> '' in the string.
+     *    Single quotes must be doubled, i.e. ' -> '' in the string.
      *  @param o parameter, not translated.
      *    To translate parameter also, use _t("foo {0} bar", _t("baz"))
      *    Do not double the single quotes in the parameter.